Street Fighter V Arcade Edition got a new character with Kage and as with many others his appearance comes with a cameo. In Kage arcade mode run we get to see Oni make an appearance.
Now this is far from saying Oni will be in the game as many other characters have appeared in story and arcade mode but not as playable character. Oro, Crimson Viper and Gill are proof of that. But then again that can change. I will let you know if I hear anything.
As always thank you for reading.